package com.hmdp.service.impl;

import com.hmdp.config.RedisIdWorker;
import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.SimpleRedisLock;
import com.hmdp.utils.UserHolder;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.aop.framework.AopContext;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.time.LocalDateTime;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service

public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {
   @Resource
   private ISeckillVoucherService iSeckillVoucherService;
   @Resource
   private RedisIdWorker redisIdWorker;
   @Resource
   private RedissonClient redissonClient;
   @Resource
   private StringRedisTemplate stringRedisTemplate;
   public Result seckillVoucher(Long voucherId){

        //查询优惠券
        SeckillVoucher voucher=iSeckillVoucherService.getById(voucherId);
       System.out.println(voucher);
        //判断秒杀是否开始
        if(voucher.getBeginTime().isAfter(LocalDateTime.now())){
            return Result.fail("秒杀尚未开始");
        }
        //判断秒杀是否结束
        if(voucher.getEndTime().isBefore(LocalDateTime.now())){
            return Result.fail("秒杀已经结束");
        }
        //判断库存是否充足
        if(voucher.getStock()<1){
            return Result.fail("库存不足");
        }
       Long userId=UserHolder.getUser().getId();
      //分布式锁
       RLock lock=redissonClient.getLock("lock:order:"+userId);
       boolean isLock=lock.tryLock();
       System.out.println(lock+"lock");
       if(!isLock){
           return Result.fail("不允许重复下单");
       }

        //原方法
//       SimpleRedisLock lock=new SimpleRedisLock("order:"+userId,stringRedisTemplate);
//       boolean isLock=lock.tryLock(1200);
//       if(!isLock){
//           return Result.fail("不允许重复下单");
//       }
       try {
           int count = query().eq("user_id", userId).eq("voucher_id", voucherId).count();

                      if(count>0){
                return Result.fail("用户购买过一次");
            }
            //扣减库存
            boolean success=iSeckillVoucherService.update().setSql("stock=stock-1").eq("voucher_id",voucherId).update();
            //乐观锁
//       boolean success=iSeckillVoucherService.update().setSql("stock=stock-1").eq("voucher_id",voucherId).gt("stock",0).update();
            if(!success){
                return Result.fail("库存不足");
            }
            VoucherOrder voucherOrder=new VoucherOrder();
            long orderId=redisIdWorker.nextId("order");
            voucherOrder.setId(orderId);

            voucherOrder.setUserId(userId);
            voucherOrder.setVoucherId(voucherId);
            save(voucherOrder);
            return Result.ok(orderId);
       }finally {

           lock.unlock();
       }
    }
//    @Transactional
//    public synchronized Result createVoucherOrder(Long voucherId){
//        //一人一单
//        Long userId=UserHolder.getUser().getId();
//
//        synchronized (userId.toString().intern()){
//            return this.createVoucherOrder(voucherId);
//           if(count>0){
//                return Result.fail("用户购买过一次");
//            }
//            //扣减库存
//            boolean success=iSeckillVoucherService.update().setSql("stock=stock-1").eq("voucher_id",voucherId).update();
//            //乐观锁
////       boolean success=iSeckillVoucherService.update().setSql("stock=stock-1").eq("voucher_id",voucherId).gt("stock",0).update();
//            if(!success){
//                return Result.fail("库存不足");
//            }
//            VoucherOrder voucherOrder=new VoucherOrder();
//            long orderId=redisIdWorker.nextId("order");
//            voucherOrder.setId(orderId);
//
//            voucherOrder.setUserId(userId);
//            voucherOrder.setVoucherId(voucherId);
//            save(voucherOrder);
//            return Result.ok(orderId);
//        }
//
//
//    }

}
